Compressors, Gas Turbines and Jet Engines
The clearance volume of the air compressor is kept minimum because

It permits isothermal compression
It greatly affects volumetric efficiency
It allows maximum compression to be achieved
It results in minimum work

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Compressors, Gas Turbines and Jet Engines
In air compressors, free air delivery means the

Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
None of the listed here
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Isothermal h.p. to the BHP of motor
Isothermal h.p. to adiabatic h.p.
Power to drive compressor to isothermal h.p.
Work to compress air isothermally to work for actual compression

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